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Stock-Based Compensation - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share based compensation income       $ 0 $ 0 $ 0 $ (1)  
Stock Appreciation Rights [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted, SARs 809 1,043 437          
Percentage of SARs vested immediately upon grant 25.00% 25.00%            
Percentage of SAR's vesting annually 25.00% 25.00% 33.30%          
SAR award vesting period 3 years 3 years 3 years          
Expected life of awards       5 years        
Total outstanding awards       217   217   603
Share based compensation income             $ 1